Why is the back of the cell phone glass?

I think the front of the cell phone is glass because I have to touch it.

Why is the back of the cell phone glass?

It's the back, so there doesn't seem to be a need to use glass.

It'll be stronger if you just use an iron plate.Is there a reason for

?

Or is there a reason why tempered glass is stronger and it doesn't scratch well?

815 2017-06-12 Gentleman

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